package com.minicat.server;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class StaticResourceUtil {

    /**
     * 获取静态资源文件的绝对路径
     * @param path
     * @return
     */
    public static String getAbsolutePath(String path){
        String absolutePath = StaticResourceUtil.class.getResource("/").getPath();
        return absolutePath.replaceAll("\\\\","/")+path;
    }

    public static void outputStaticResource(InputStream inputStream, OutputStream outputStream,String contentType) throws IOException {
        int count = 0;
        while (count == 0){
            count = inputStream.available();
        }
        int resourceSize = count;
        //输出http请求头,然后再输出具体内容
        outputStream.write(HttpProtocolUtil.getHttp200(resourceSize,contentType).getBytes());
        //读取内容输出
        long written = 0L;//已经读取的内容长度
        int byteSize = 1024;//计划每次缓冲的长度
        byte[] bytes = new byte[byteSize];
        while (written < resourceSize){
            if (written + byteSize > resourceSize){//说明剩余未读取大小不足一个1024长度，那就按照真实长度处理
                byteSize = (int)(resourceSize - written);//剩余的文件内容长度
            }
            inputStream.read(bytes);
            outputStream.write(bytes);
            outputStream.flush();
            written += byteSize;
        }
    }

    /**
     * 读取静态资源文件输入流，通过输出流输出
     */
    public static void outputStaticResource(InputStream inputStream, OutputStream outputStream) throws IOException {
        int count = 0;
        while (count == 0){
            count = inputStream.available();
        }
        int resourceSize = count;
        //输出http请求头,然后再输出具体内容
        outputStream.write(HttpProtocolUtil.getHttp200(resourceSize).getBytes());
        //读取内容输出
        long written = 0L;//已经读取的内容长度
        int byteSize = 1024;//计划每次缓冲的长度
        byte[] bytes = new byte[byteSize];
        while (written < resourceSize){
            if (written + byteSize > resourceSize){//说明剩余未读取大小不足一个1024长度，那就按照真实长度处理
                byteSize = (int)(resourceSize - written);//剩余的文件内容长度
            }
            inputStream.read(bytes);
            outputStream.write(bytes);
            outputStream.flush();
            written += byteSize;
        }
    }
}
